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(#) Implied Quantities

!!! ERROR: Implied Quantities
   This is an error.

Id
:   `ImpliedQuantity`
Summary
:   Implied Quantities
Severity
:   Error
Category
:   Correctness: Messages
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/guide/topics/resources/string-resource.html#Plurals
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/PluralsDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/PluralsDetectorTest.java)
Copyright Year
:   2013

Plural strings should generally include a `%s` or `%d` formatting
argument. In locales like English, the `one` quantity only applies to a
single value, 1, but that's not true everywhere. For example, in
Slovene, the `one` quantity will apply to 1, 101, 201, 301, and so on.
Similarly, there are locales where multiple values match the `zero` and
`two` quantities.

In these locales, it is usually an error to have a message which does
not include a formatting argument (such as '%d'), since it will not be
clear from the grammar what quantity the quantity string is describing.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/values-sl/plurals2.xml:4:Error: The quantity 'one' matches more than
one specific number in this locale (1, 101, 201, 301, 401, 501, 601,
701, 1001, …), but the message did not include a formatting argument
(such as %d). This is usually an internationalization error. See full
issue explanation for more. [ImpliedQuantity]
    &lt;item quantity="one"&gt;Znaleziono jedną piosenkę.&lt;/item&gt;
    ------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`res/values/plurals.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;
    &lt;plurals name="my_plural"&gt;
        &lt;item quantity="one"&gt;@string/hello&lt;/item&gt;
        &lt;item quantity="few"&gt;@string/hello&lt;/item&gt;
        &lt;item quantity="other"&gt;@string/hello&lt;/item&gt;
    &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values/plurals2.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;
    &lt;plurals name="numberOfSongsAvailable"&gt;
        &lt;item quantity="one"&gt;One song found.&lt;/item&gt;
        &lt;item quantity="other"&gt;%d songs found.&lt;/item&gt;
    &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values-pl/plurals2.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;
    &lt;plurals name="numberOfSongsAvailable"&gt;
        &lt;item quantity="one"&gt;Znaleziono jedną piosenkę.&lt;/item&gt;
        &lt;item quantity="few"&gt;Znaleziono %d piosenki.&lt;/item&gt;
        &lt;item quantity="other"&gt;Znaleziono %d piosenek.&lt;/item&gt;
    &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values-sl/plurals2.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;
    &lt;plurals name="numberOfSongsAvailable"&gt;
        &lt;item quantity="one"&gt;Znaleziono jedną piosenkę.&lt;/item&gt;
        &lt;item quantity="few"&gt;Znaleziono %d piosenki.&lt;/item&gt;
        &lt;item quantity="other"&gt;Znaleziono %d piosenek.&lt;/item&gt;
    &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/PluralsDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `PluralsDetector.testImpliedQuantity`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute `tools:ignore="ImpliedQuantity"` on
  the problematic XML element (or one of its enclosing elements). You
  may also need to add the following namespace declaration on the root
  element in the XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;resources xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;plurals tools:ignore="ImpliedQuantity" .../&gt;
    ...
  &lt;/resources&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="ImpliedQuantity" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'ImpliedQuantity'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore ImpliedQuantity ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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